This is a really strange problem. We have engineering drawings that are produced for 11 x 17 page size. When printing them to either a Xerox Workcentre 5665 or 5645 OR an HP Laserjet 9050 the page size that the printer thinks is needed is 10.79 x 16.79.
In the print dialog box in Acrobat (Reader 9 or 8, also Pro 8.1.2) I've selected Fit to printable area and the preview shows 11 x 17 on the page size. When it gets to the printer, the printer sees the request as for that other paper size.
I can print the doc as an image and it comes out OK.
This seems like an Acrobat problem since it doesn't seem to matter which printer I select, but it's happening in multiple versions of Acrobat, both Reader and Pro.